Silke Britzen. Max-Planck-Institut für Radioastronomie Bonn

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1 Silke Britzen Max-Planck-Institut für Radioastronomie Bonn

2 -The Action Black Holes in a Violent Universe - Our COST Action: what we are aiming at... - How Black Holes drive our Universe! - What are the most important questions we are addressing?

3 COST (European Cooperation in Science and Technology) is one of the longest-running European instruments supporting cooperation among scientists and researchers across Europe

4 Who we are Black Hole scientists from 22 countries 4

5 Black Holes are the engines of our Universe s history Galactic Center Black Hole Primordial Black Holes Expanding Universe after 13.7 billion years Stellar Black Holes / Pulsars Supermassive Black Holes 4

6 How did BHs form in the early Universe? Primordial BHs were they formed? Can their existence be proven? How do mergers work? How do BHs grow? Merger? Accretion? What kind of new physics describes BHs? How can we directly proof the Galactic How massive can stellar BHs be? How do they form? Center BH? What will gravitational waves tell us about the BHs? And when will they be detected? 6

7 Our BLACK HOLES Primary IN A VIOLENT Objectives UNIVERSE To enhance the understanding of the BH-phenomenon and its impact on the evolution of our Universe To study the fundamental laws of nature using an multi-disciplinary and multi-dimensional approach to BH-research To use BHs as laboratories to test new physical concepts 7

8 The Working Groups and Science 8

9 BLACK WG1: HOLES Quantum IN A VIOLENT UNIVERSE BHs Quantum Black Holes at the LHC M BH ~ g The Theory of Everything Constraints about the energy scale of the Universe How many dimensions? Primordial Black Holes M BH ~ g Possible remnants of early Universe from initial density fluctuations Hawking radiation, possible detection by Fermi? 8

10 BLACK WG1: HOLES Quantum IN A VIOLENT UNIVERSE BHs Questions to be addressed by this WG include: What is the possibility of detecting the primordial black holes evaporating in our Galaxy and close neighbourhood to our Earth? How can the evaporation of the primordial black holes be modelled? Can Quantum Black Holes play a key role in the search for a quantum theory of gravity? What is the role of Black Hole entropy? Any evidence or constraints s for GRB observations o s originating in the evaporation from Quantum Black Holes? 8

11 WG2: Stellar Black Holes / Pulsars (1 M < M BH < 100 M ) ) BLACK HOLES IN A VIOLENT UNIVERSE Crab Nebula optical infrared X-rays &optical NASA/ESA Spitzer. Hubble & Chandra. Pulsars as precise cosmical clocks probes for strong gravity : space-time in violent conditions Direct Detection & study of gravitational wave background by pulsar- timing arrays 9 W. Folkner, LISA, JPL

12 WG2: Stellar Black Holes / Pulsars (1 M < M BH < 100 M ) ) BLACK HOLES IN A VIOLENT UNIVERSE Science topics for this WG: Search for a pulsar orbiting a Black Hole to probe how space and time behave under extreme conditions Search for a pulsar in orbit around the Galactic Centre Black Hole to probe its curved spacetime Investigate the gravitational wave background produced by the ensemble of SMBH binaries (nano-hz gravitational wave signals) and gain insight into the history of SMBH mergers throughout the history of the Universe Detect single merger events of SMBH binaries (with 100 million to one billion solar masses out to a distance of several 100 million light years) 9

13 WG3: Galactic Center BH (~4x10 6 M ) ) BLACK HOLES IN A VIOLENT UNIVERSE MPE Garching VLBI 86 GHz 19 R s size s D. Wang et al., CXC, NASA Krichbaum et al

14 WG3: Galactic Center BH (~4x10 6 M ) ) BLACK HOLES IN A VIOLENT UNIVERSE This WG is interested in: High resolution 1mm-VLBI observations of SgrA* - the event horizon the Black Hole and the silhouette of radiation surrounding it Investigations of the extremely rapidly variable (near-infrared and X-ray) emission of SgrA* to understand accretion and emission of this most weakly accreting Black Hole Prepare observations of the nuclear star cluster Strong overlap with WG2 and WG4 synergies wanted!! 10

15 WG4: Supermassive Black Holes BLACK HOLES IN A VIOLENT UNIVERSE ( M ) Robert Gendler Normal Galaxies Colliding Galaxies NASA, ESA, and the Hubble SM4 ERO Team Active Galactic Nuclei Starburst galaxies NASA/CXC, NRAO/VLA, Digitized Sky Survey, NASA/JPL-Caltech/Subaru 11

16 WG4: Supermassive Black Holes BLACK HOLES IN A VIOLENT UNIVERSE ( M ) This WG deals with questions such as: When and how did the first SMBHs form in the early Universe? What is the relative importance of accretion and mergers in the growth of the SMBH masses and in the evolution of their spin? How are jets formed, accelerated and collimated? What do jets consist of? How to find SMBH binary systems observationally? How to model SMBH binary merger? With conservative dynamics and including dissipative elements 11

17 How our COST-Action works 17

18 How COST works WG meetings Conferences Activities Webpage Gender Forum Short Term Scientific Missions= scientific travelling Training Schools Encyclopedia

19 The goal of COST is to ensure that Europe holds a strong position in the field of scientific and technical research for peaceful purposes, by increasing European cooperation and interaction in this field... Hence the funding and support for: Short Term Scientific Missions (STSMs)

20 Find out more about our Action MP0905 at: mpg Soon to come: - Blog on latest Black Hole News (worldwide) -GenderForum - Results from STSM travellers -... ACTION MP0905

21 21

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